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GLOBAL_CONFIG_SITE={configTitle:"云少IT",title:"二、RabbitMQ-客户端源码之AMQConnection",postAI:"true",pageFillDescription:"上一篇文章一客户端源码之中阐述了方法完成之后客户端就已经和建立了正常的连接而这个的关键就在于这个方法之内下面我们来慢慢分析首先来看看方法的源码这个方法有点长这里拆开来一一分析首先是注释首先来看看方法上的注释说了什么方法的作用是启动连接包括启动线程这个线程主要是和进行通信交互处理通信帧的一个线程非常的重要这个方法会在建立连接的初始化阶段会进行调用之后再等待这里的都是指协议层面的这个可以参考本文中第一张使用抓包的网络截图一一对应的关系通过回复的帧帧中包含三个参数设置以及的参数值一些异常情况首先是初始化工作线程池和初始化心跳线程并设置运行状态为这个值会在线程中有用控制线程是否继续运行这句代码从命名上来说像是其实这么理解也没错这个版本的客户端与端的通信是采用原生当然后面也改成了这个自然是后话程序中会对各种帧进行处理处理的方式也不是单一化的这里举这个类型的报文做分析当发送至端收到之后进行处理线程中然后将此报文存入中照着深究下去其就是一个容量为的也就是当主导的线程将收到的存入其中然后类的线程在等待方法下面的代码然后继续处理这看上去也算是个等待别的线程这个线程同样在等待的返回处理完毕这个之后会讲到下面的将这个任务放入中如果深入代码看的话中当前至多只能一个如果当前的没有处理完再的话会被阻塞直到处理完当前的才能下一个接下来主要是发送帧可参考下图这个客户端与建立连接的协议的第一帧帧中的内容包括的版本号这里发就是前面提到的对象我们来看看做了什么本段代码在类中上面这段对照着下图一目了然下面就是最重要的线程了这里先跳过接下去看看方法之后就是的来回以及设置和的参数值当然在设置之前还初始化了至于可以简单的理解为管理的一个类具体实现细节可以参考三客户端源码之接着回顾在方法中关于的代码主要有这段代码主要是初始化线程对象然后让其运行没有什么特别之处而特别之处在于本身类是类的私有内部类线程主要用来处理通信帧有关的细节将会在四客户端源码之中陈述的可以看到当调用方法后就设置为那么线程一直在运行线程当读取到通信帧之后判断是否是心跳帧如果是则忽略继续监听如果是其他帧则判断其值是否为值为代表的是特殊帧这些特殊帧是和有关的而不是和有关的上面代码里的就是里的一般类型的帧的为而其余类别帧的大于这里就分和分别进行处理当即则直接调用的方法这个是在类中创建的私有变量调用的方法有关的更多实现细节可以参考五客户端源码之对于为的帧的方法都是返回有关的实现细节可以参考六客户端源码之进而调用的方法进而调用的方法这个方法在类中是一个抽象方法而观察中的私有变量其正好实现了这个方法中也实现了方法有关的实现细节可以参考八客户端源码之进而调用了的方法这个方法是用来处理控制命令的正常情况下比如直接返回这样就会运行到这句代码意思就是将从接受到的对象存入对象确切的来说是这个对象中更确切的来说是存放到容量为的中等待其余的线程来有关或者细节可以参考五客户端源码之我们假设有一个可靠的面向流的网络传输层或相当在单个套接字连接中可以存在多个独立控制线程这些称之为通道每个帧都使用通道编号来编号通过交织他们的帧不同的通道共享连接对于给定的通道帧运行在一个严格的序列这样可以用来驱动一个协议解析器通常是一个状态机当则需要从中根据找出相应的再调用方法处理这里的从何而来这里就还是要到的方法来看有这么一句类中的构造方法构造方法中的参数就是中方法第一行代码初始化的对象有关的实现细节可以参考三客户端源码之当等于的时候是调用也可以说是的内部成员变量来处理当不等于时这个接下去的处理就要涉及到整个代码最核心的类可以类别上上面为的情况具体可以参考八客户端源码之",isPost:!0,isHome:!1,isHighlightShrink:!0,isToc:!1,postUpdate:"2020-10-02 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itemprop="name headline">二、RabbitMQ-客户端源码之AMQConnection</h1><span itemprop="author" itemscope itemtype="http://schema.org/Person">云少</span><time itemprop="dateCreated datePublished" datetime="2020-10-02T14:29:54.000Z" title="发表于 2020-10-02 22:29:54">2020-10-02</time><time itemprop="dateCreated datePublished" datetime="2020-10-02T14:29:54.000Z" title="更新于 2020-10-02 22:29:54">2020-10-02</time></header><p>上一篇文章（<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214708">[一]RabbitMQ-客户端源码之ConnectionFactory</a>）中阐述了conn.start()方法完成之后客户端就已经和broker建立了正常的连接，而这个Connection的关键就在于这个start()方法之内，下面我们来慢慢分析。</p><p>首先来看看start()方法的源码，这个方法有点长，这里拆开来一一分析，首先是注释：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Start up the connection, including the MainLoop thread.</span></span><br><span class="line"><span class="comment"> * Sends the protocol</span></span><br><span class="line"><span class="comment"> * version negotiation header, and runs through</span></span><br><span class="line"><span class="comment"> * Connection.Start/.StartOk, Connection.Tune/.TuneOk, and then</span></span><br><span class="line"><span class="comment"> * calls Connection.Open and waits for the OpenOk. Sets heart-beat</span></span><br><span class="line"><span class="comment"> * and frame max values after tuning has taken place.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@throws</span> IOException if an error is encountered</span></span><br><span class="line"><span class="comment"> * either before, or during, protocol negotiation;</span></span><br><span class="line"><span class="comment"> * sub-classes &#123;<span class="doctag">@link</span> ProtocolVersionMismatchException&#125; and</span></span><br><span class="line"><span class="comment"> * &#123;<span class="doctag">@link</span> PossibleAuthenticationFailureException&#125; will be thrown in the</span></span><br><span class="line"><span class="comment"> * corresponding circumstances. &#123;<span class="doctag">@link</span> AuthenticationFailureException&#125;</span></span><br><span class="line"><span class="comment"> * will be thrown if the broker closes the connection with ACCESS_REFUSED.</span></span><br><span class="line"><span class="comment"> * If an exception is thrown, connection resources allocated can all be</span></span><br><span class="line"><span class="comment"> * garbage collected when the connection object is no longer referenced.</span></span><br><span class="line"><span class="comment"> */</span></span><br></pre></td></tr></table></figure><p>首先来看看方法上的注释说了什么：</p><ul><li>方法的作用是启动连接（start up the connection）, 包括启动MainLoop线程，这个MainLoop线程主要是和broker进行通信交互处理通信帧（Frame）的一个线程（非常的重要！！！）。</li><li>这个方法会在建立连接的初始化阶段（negotiation）会进行Connection.Start&#x2F;.StartOk, Connection.Tune&#x2F;.TuneOk, 调用Connection.Open之后再等待Conenction.OpenOk(这里的都是指AMQP协议层面的)，这个可以参考本文中第一张使用wireshark抓包的网络截图，一一对应的关系。</li><li>通过broker回复的Connection.Tune帧（帧中包含Channel-Max, Frame-Max, Heartbeat三个参数）设置channelMax, frameMax以及Heartbeat的参数值。</li><li>一些异常情况。</li></ul><hr><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">start</span><span class="params">()</span></span><br><span class="line">        <span class="keyword">throws</span> IOException, TimeoutException &#123;</span><br><span class="line">    initializeConsumerWorkService();</span><br><span class="line">    initializeHeartbeatSender();</span><br><span class="line">    <span class="built_in">this</span>._running = <span class="literal">true</span>;</span><br><span class="line">    <span class="comment">// Make sure that the first thing we do is to send the header,</span></span><br><span class="line">    <span class="comment">// which should cause any socket errors to show up for us, rather</span></span><br><span class="line">    <span class="comment">// than risking them pop out in the MainLoop</span></span><br><span class="line">    AMQChannel.<span class="type">SimpleBlockingRpcContinuation</span> <span class="variable">connStartBlocker</span> <span class="operator">=</span></span><br><span class="line">        <span class="keyword">new</span> <span class="title class_">AMQChannel</span>.SimpleBlockingRpcContinuation();</span><br><span class="line">    <span class="comment">// We enqueue an RPC continuation here without sending an RPC</span></span><br><span class="line">    <span class="comment">// request, since the protocol specifies that after sending</span></span><br><span class="line">    <span class="comment">// the version negotiation header, the client (connection</span></span><br><span class="line">    <span class="comment">// initiator) is to wait for a connection.start method to</span></span><br><span class="line">    <span class="comment">// arrive.</span></span><br><span class="line">    _channel0.enqueueRpc(connStartBlocker);</span><br></pre></td></tr></table></figure><p>首先是初始化工作线程池（initializeConsumerWorkService）和初始化心跳线程（initializeHeartbeatSender）并设置运行状态为true(this._isrunning&#x3D;true，这个值会在MainLoop线程中有用，控制MainLoop线程是否继续运行)。</p><p>“AMQChannel.SimpleBlockingRpcContinuation connStartBlocker &#x3D; new AMQChannel.SimpleBlockingRpcContinuation();”这句代码，从命名上来说像是rpc, 其实这么理解也没错。RabbitMQ-Client这个版本（3.5.3）的客户端与broker端的通信是采用java原生socket.当然后面也改成了NIO，这个自然是后话。RabbitMQ-Client程序中会对各种帧进行处理，处理的方式也不是单一化的，这里举Connection.Start这个类型的报文做分析。当broker发送Connection.Start至client端，client收到之后进行处理（MainLoop线程中），然后将此报文存入SimpleBlockingRpcContinuation中，照着SimpleBlockingRpcContinuation深究下去，其就是一个容量为1的BlockingQueue,也就是当MainLoop主导的线程将收到的Connection.Start存入其中，然后AMQConnction类的start()线程在等待（start()方法下面的代码）：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">connStart = (AMQP.Connection.Start) connStartBlocker.getReply(HANDSHAKE_TIMEOUT/<span class="number">2</span>).getMethod();</span><br></pre></td></tr></table></figure><p>然后继续处理。这看上去也算是个rpc，等待别的线程（这个线程同样在等待broker的返回）处理完毕。</p><p>AMQCommand(这个之后会讲到), 下面的“_channel0.enqueueRpc(connStartBlocker)”将这个rpc任务放入Channel中，如果深入代码看的话，channel中当前至多只能enqueue一个rpc，如果当前的rpc没有处理完再enqueue的话会被阻塞（wait()）直到处理完当前的rpc才能enqueue下一个rpc。</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">try</span> &#123;</span><br><span class="line">    <span class="comment">// The following two lines are akin to AMQChannel&#x27;s</span></span><br><span class="line">    <span class="comment">// transmit() method for this pseudo-RPC.</span></span><br><span class="line">    _frameHandler.setTimeout(HANDSHAKE_TIMEOUT);</span><br><span class="line">    _frameHandler.sendHeader();</span><br><span class="line">&#125; <span class="keyword">catch</span> (IOException ioe) &#123;</span><br><span class="line">    _frameHandler.close();</span><br><span class="line">    <span class="keyword">throw</span> ioe;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>接下来“_frameHandler.sendHeader()”主要是发送Protocol-Header 0-9-1帧（可参考下图），这个客户端与broker建立连接的AMQP协议的第一帧，帧中的内容包括AMQP的版本号。这里发_frameHandler就是前面Connection提到的SocketFrameHandler对象，我们来看看sendHeader()做了什么：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//本段代码在SocketFrameHandler类中</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">sendHeader</span><span class="params">(<span class="type">int</span> major, <span class="type">int</span> minor, <span class="type">int</span> revision)</span> <span class="keyword">throws</span> IOException &#123;</span><br><span class="line">      <span class="keyword">synchronized</span> (_outputStream) &#123;</span><br><span class="line">          _outputStream.write(<span class="string">&quot;AMQP&quot;</span>.getBytes(<span class="string">&quot;US-ASCII&quot;</span>));</span><br><span class="line">          _outputStream.write(<span class="number">0</span>);</span><br><span class="line">          _outputStream.write(major);</span><br><span class="line">          _outputStream.write(minor);</span><br><span class="line">          _outputStream.write(revision);</span><br><span class="line">          _outputStream.flush();</span><br><span class="line">      &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">sendHeader</span><span class="params">()</span> <span class="keyword">throws</span> IOException &#123;</span><br><span class="line">      sendHeader(AMQP.PROTOCOL.MAJOR, AMQP.PROTOCOL.MINOR, AMQP.PROTOCOL.REVISION);</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure><p>上面这段对照着下图一目了然：<br><img src= "" onerror="this.onerror=null,this.src=&quot;/img/404.jpg&quot;" data-lazy-src="https://imgconvert.csdnimg.cn/aHR0cDovL2ltZy5ibG9nLmNzZG4ubmV0LzIwMTcwNDE3MTg1MDQ2NTUz?x-oss-process=image/format,png" alt="这里写图片描述"></p><hr><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// start the main loop going</span></span><br><span class="line"><span class="type">MainLoop</span> <span class="variable">loop</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">MainLoop</span>();</span><br><span class="line"><span class="keyword">final</span> <span class="type">String</span> <span class="variable">name</span> <span class="operator">=</span> <span class="string">&quot;AMQP Connection &quot;</span> + getHostAddress() + <span class="string">&quot;:&quot;</span> + getPort();</span><br><span class="line">mainLoopThread = Environment.newThread(threadFactory, loop, name);</span><br><span class="line">mainLoopThread.start();</span><br><span class="line"><span class="comment">// after this point clear-up of MainLoop is triggered by closing the frameHandler.</span></span><br></pre></td></tr></table></figure><p>下面就是最重要的MainLoop线程了。这里先跳过，接下去看看start()方法，之后就是Connection.Start&#x2F;.StartOk, Connection.Tune&#x2F;.TuneOk, Connection.Open&#x2F;.OpenOk的来回negotiation，以及设置channelMax, frameMax和heartbeat的参数值。当然在设置frameMax之前还初始化了ChannelManager，至于ChannelManager可以简单的理解为管理Channel的一个类，具体实现细节可以参考（<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214754">[三]RabbitMQ-客户端源码之ChannelManager</a>）</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br></pre></td><td class="code"><pre><span class="line">    AMQP.Connection.<span class="type">Start</span> <span class="variable">connStart</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line">    AMQP.Connection.<span class="type">Tune</span> <span class="variable">connTune</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        connStart =</span><br><span class="line">                (AMQP.Connection.Start) connStartBlocker.getReply(HANDSHAKE_TIMEOUT/<span class="number">2</span>).getMethod();</span><br><span class="line"></span><br><span class="line">        _serverProperties = Collections.unmodifiableMap(connStart.getServerProperties());</span><br><span class="line"></span><br><span class="line">        <span class="type">Version</span> <span class="variable">serverVersion</span> <span class="operator">=</span></span><br><span class="line">                <span class="keyword">new</span> <span class="title class_">Version</span>(connStart.getVersionMajor(),</span><br><span class="line">                                   connStart.getVersionMinor());</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (!Version.checkVersion(clientVersion, serverVersion)) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">ProtocolVersionMismatchException</span>(clientVersion,</span><br><span class="line">                                                              serverVersion);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        String[] mechanisms = connStart.getMechanisms().toString().split(<span class="string">&quot; &quot;</span>);</span><br><span class="line">        <span class="type">SaslMechanism</span> <span class="variable">sm</span> <span class="operator">=</span> <span class="built_in">this</span>.saslConfig.getSaslMechanism(mechanisms);</span><br><span class="line">        <span class="keyword">if</span> (sm == <span class="literal">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">IOException</span>(<span class="string">&quot;No compatible authentication mechanism found - &quot;</span> +</span><br><span class="line">                                          <span class="string">&quot;server offered [&quot;</span> + connStart.getMechanisms() + <span class="string">&quot;]&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="type">LongString</span> <span class="variable">challenge</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line">        <span class="type">LongString</span> <span class="variable">response</span> <span class="operator">=</span> sm.handleChallenge(<span class="literal">null</span>, <span class="built_in">this</span>.username, <span class="built_in">this</span>.password);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">do</span> &#123;</span><br><span class="line">            <span class="type">Method</span> <span class="variable">method</span> <span class="operator">=</span> (challenge == <span class="literal">null</span>)</span><br><span class="line">                                    ? <span class="keyword">new</span> <span class="title class_">AMQP</span>.Connection.StartOk.Builder()</span><br><span class="line">                                              .clientProperties(_clientProperties)</span><br><span class="line">                                              .mechanism(sm.getName())</span><br><span class="line">                                              .response(response)</span><br><span class="line">                                              .build()</span><br><span class="line">                                    : <span class="keyword">new</span> <span class="title class_">AMQP</span>.Connection.SecureOk.Builder().response(response).build();</span><br><span class="line"></span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                <span class="type">Method</span> <span class="variable">serverResponse</span> <span class="operator">=</span> _channel0.rpc(method, HANDSHAKE_TIMEOUT/<span class="number">2</span>).getMethod();</span><br><span class="line">                <span class="keyword">if</span> (serverResponse <span class="keyword">instanceof</span> AMQP.Connection.Tune) &#123;</span><br><span class="line">                    connTune = (AMQP.Connection.Tune) serverResponse;</span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    challenge = ((AMQP.Connection.Secure) serverResponse).getChallenge();</span><br><span class="line">                    response = sm.handleChallenge(challenge, <span class="built_in">this</span>.username, <span class="built_in">this</span>.password);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">catch</span> (ShutdownSignalException e) &#123;</span><br><span class="line">                <span class="type">Method</span> <span class="variable">shutdownMethod</span> <span class="operator">=</span> e.getReason();</span><br><span class="line">                <span class="keyword">if</span> (shutdownMethod <span class="keyword">instanceof</span> AMQP.Connection.Close) &#123;</span><br><span class="line">                    AMQP.Connection.<span class="type">Close</span> <span class="variable">shutdownClose</span> <span class="operator">=</span> (AMQP.Connection.Close) shutdownMethod;</span><br><span class="line">                    <span class="keyword">if</span> (shutdownClose.getReplyCode() == AMQP.ACCESS_REFUSED) &#123;</span><br><span class="line">                        <span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">AuthenticationFailureException</span>(shutdownClose.getReplyText());</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">PossibleAuthenticationFailureException</span>(e);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">while</span> (connTune == <span class="literal">null</span>);</span><br><span class="line">    &#125; <span class="keyword">catch</span> (TimeoutException te) &#123;</span><br><span class="line">        _frameHandler.close();</span><br><span class="line">        <span class="keyword">throw</span> te;</span><br><span class="line">    &#125; <span class="keyword">catch</span> (ShutdownSignalException sse) &#123;</span><br><span class="line">        _frameHandler.close();</span><br><span class="line">        <span class="keyword">throw</span> AMQChannel.wrap(sse);</span><br><span class="line">    &#125; <span class="keyword">catch</span>(IOException ioe) &#123;</span><br><span class="line">        _frameHandler.close();</span><br><span class="line">        <span class="keyword">throw</span> ioe;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        <span class="type">int</span> <span class="variable">channelMax</span> <span class="operator">=</span></span><br><span class="line">            negotiateChannelMax(<span class="built_in">this</span>.requestedChannelMax,</span><br><span class="line">                                connTune.getChannelMax());</span><br><span class="line">        _channelManager = instantiateChannelManager(channelMax, threadFactory);</span><br><span class="line"></span><br><span class="line">        <span class="type">int</span> <span class="variable">frameMax</span> <span class="operator">=</span></span><br><span class="line">            negotiatedMaxValue(<span class="built_in">this</span>.requestedFrameMax,</span><br><span class="line">                               connTune.getFrameMax());</span><br><span class="line">        <span class="built_in">this</span>._frameMax = frameMax;</span><br><span class="line"></span><br><span class="line">        <span class="type">int</span> <span class="variable">heartbeat</span> <span class="operator">=</span></span><br><span class="line">            negotiatedMaxValue(<span class="built_in">this</span>.requestedHeartbeat,</span><br><span class="line">                               connTune.getHeartbeat());</span><br><span class="line"></span><br><span class="line">        setHeartbeat(heartbeat);</span><br><span class="line"></span><br><span class="line">        _channel0.transmit(<span class="keyword">new</span> <span class="title class_">AMQP</span>.Connection.TuneOk.Builder()</span><br><span class="line">                            .channelMax(channelMax)</span><br><span class="line">                            .frameMax(frameMax)</span><br><span class="line">                            .heartbeat(heartbeat)</span><br><span class="line">                          .build());</span><br><span class="line">        _channel0.exnWrappingRpc(<span class="keyword">new</span> <span class="title class_">AMQP</span>.Connection.Open.Builder()</span><br><span class="line">                                  .virtualHost(_virtualHost)</span><br><span class="line">                                .build());</span><br><span class="line">    &#125; <span class="keyword">catch</span> (IOException ioe) &#123;</span><br><span class="line">        _heartbeatSender.shutdown();</span><br><span class="line">        _frameHandler.close();</span><br><span class="line">        <span class="keyword">throw</span> ioe;</span><br><span class="line">    &#125; <span class="keyword">catch</span> (ShutdownSignalException sse) &#123;</span><br><span class="line">        _heartbeatSender.shutdown();</span><br><span class="line">        _frameHandler.close();</span><br><span class="line">        <span class="keyword">throw</span> AMQChannel.wrap(sse);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// We can now respond to errors having finished tailoring the connection</span></span><br><span class="line">    <span class="built_in">this</span>._inConnectionNegotiation = <span class="literal">false</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><hr><p>接着回顾MainLoop, 在start()方法中关于MainLoop的代码主要有：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// start the main loop going</span></span><br><span class="line"><span class="type">MainLoop</span> <span class="variable">loop</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">MainLoop</span>();</span><br><span class="line"><span class="keyword">final</span> <span class="type">String</span> <span class="variable">name</span> <span class="operator">=</span> <span class="string">&quot;AMQP Connection &quot;</span> + getHostAddress() + <span class="string">&quot;:&quot;</span> + getPort();</span><br><span class="line">mainLoopThread = Environment.newThread(threadFactory, loop, name);</span><br><span class="line">mainLoopThread.start();</span><br><span class="line"><span class="comment">// after this point clear-up of MainLoop is triggered by closing the frameHandler.</span></span><br></pre></td></tr></table></figure><p>这段代码主要是初始化MainLoop线程对象，然后让其运行。没有什么特别之处，而特别之处在于MainLoop本身。</p><p>MainLoop类是AMQConnection类的私有内部类：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">class</span> <span class="title class_">MainLoop</span> <span class="keyword">implements</span> <span class="title class_">Runnable</span> &#123;</span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * Channel reader thread main loop. Reads a frame, and if it is</span></span><br><span class="line"><span class="comment">     * not a heartbeat frame, dispatches it to the channel it refers to.</span></span><br><span class="line"><span class="comment">     * Continues running until the &quot;running&quot; flag is set false by</span></span><br><span class="line"><span class="comment">     * shutdown().</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">run</span><span class="params">()</span> &#123;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">while</span> (_running) &#123;</span><br><span class="line">                <span class="type">Frame</span> <span class="variable">frame</span> <span class="operator">=</span> _frameHandler.readFrame();</span><br><span class="line"></span><br><span class="line">                <span class="keyword">if</span> (frame != <span class="literal">null</span>) &#123;</span><br><span class="line">                    _missedHeartbeats = <span class="number">0</span>;</span><br><span class="line">                    <span class="keyword">if</span> (frame.type == AMQP.FRAME_HEARTBEAT) &#123;</span><br><span class="line">                        <span class="comment">// Ignore it: we&#x27;ve already just reset the heartbeat counter.</span></span><br><span class="line">                    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                        <span class="keyword">if</span> (frame.channel == <span class="number">0</span>) &#123; <span class="comment">// the special channel</span></span><br><span class="line">                            _channel0.handleFrame(frame);</span><br><span class="line">                        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                            <span class="keyword">if</span> (isOpen()) &#123;</span><br><span class="line">                                <span class="comment">// If we&#x27;re still _running, but not isOpen(), then we</span></span><br><span class="line">                                <span class="comment">// must be quiescing, which means any inbound frames</span></span><br><span class="line">                                <span class="comment">// for non-zero channels (and any inbound commands on</span></span><br><span class="line">                                <span class="comment">// channel zero that aren&#x27;t Connection.CloseOk) must</span></span><br><span class="line">                                <span class="comment">// be discarded.</span></span><br><span class="line">                                <span class="type">ChannelManager</span> <span class="variable">cm</span> <span class="operator">=</span> _channelManager;</span><br><span class="line">                                <span class="keyword">if</span> (cm != <span class="literal">null</span>) &#123;</span><br><span class="line">                                    cm.getChannel(frame.channel).handleFrame(frame);</span><br><span class="line">                                &#125;</span><br><span class="line">                            &#125;</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    <span class="comment">// Socket timeout waiting for a frame.</span></span><br><span class="line">                    <span class="comment">// Maybe missed heartbeat.</span></span><br><span class="line">                    handleSocketTimeout();</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">catch</span> (EOFException ex) &#123;</span><br><span class="line">            <span class="keyword">if</span> (!_brokerInitiatedShutdown)</span><br><span class="line">                shutdown(<span class="literal">null</span>, <span class="literal">false</span>, ex, <span class="literal">true</span>);</span><br><span class="line">        &#125; <span class="keyword">catch</span> (Throwable ex) &#123;</span><br><span class="line">            _exceptionHandler.handleUnexpectedConnectionDriverException(AMQConnection.<span class="built_in">this</span>,</span><br><span class="line">                                                                        ex);</span><br><span class="line">            shutdown(<span class="literal">null</span>, <span class="literal">false</span>, ex, <span class="literal">true</span>);</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="comment">// Finally, shut down our underlying data connection.</span></span><br><span class="line">            _frameHandler.close();</span><br><span class="line">            _appContinuation.set(<span class="literal">null</span>);</span><br><span class="line">            notifyListeners();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>MainLoop线程主要用来处理通信帧（Frame，有关Frame的细节将会在（<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214776">[四]RabbitMQ-客户端源码之Frame</a>）中陈述）的，可以看到当AMQConnection调用start()方法后，_isrunning就设置为true，那么线程一直在运行（while(true)）。</p><p>MainLoop线程当读取到通信帧之后，判断是否是心跳帧，如果是则忽略继续监听。如果是其他帧，则判断其frame.channel值是否为0，frame.channel值为0代表的是特殊帧，这些特殊帧是和Connection有关的，而不是和Channel有关的（上面代码里的frame.channel就是Channel里的channel number, 一般Connection类型的帧的channel number为0，而其余Channel类别帧的channel number大于0。）</p><p>这里就分channel_number&#x3D;0和channel_number !&#x3D;0分别进行处理。<br>当channel_number&#x3D;0即frame.channel&#x3D;0则直接调用_channel0的handleFrame方法。<br>这个_channel0是在AMQConnection类中创建的私有变量：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">final</span> <span class="type">AMQChannel</span> <span class="variable">_channel0</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">AMQChannel</span>(<span class="built_in">this</span>, <span class="number">0</span>) &#123;</span><br><span class="line">    <span class="meta">@Override</span> <span class="keyword">public</span> <span class="type">boolean</span> <span class="title function_">processAsync</span><span class="params">(Command c)</span> <span class="keyword">throws</span> IOException &#123;</span><br><span class="line">        <span class="keyword">return</span> getConnection().processControlCommand(c);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure><p>调用AMQChannel的handleFrame方法（有关AMQChannel的更多实现细节可以参考：（<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214791">[五]RabbitMQ-客户端源码之AMQChannel</a>））：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">handleFrame</span><span class="params">(Frame frame)</span> <span class="keyword">throws</span> IOException &#123;</span><br><span class="line">    <span class="type">AMQCommand</span> <span class="variable">command</span> <span class="operator">=</span> _command;</span><br><span class="line">    <span class="keyword">if</span> (command.handleFrame(frame)) &#123; <span class="comment">// a complete command has rolled off the assembly line</span></span><br><span class="line">        _command = <span class="keyword">new</span> <span class="title class_">AMQCommand</span>(); <span class="comment">// prepare for the next one</span></span><br><span class="line">        handleCompleteInboundCommand(command);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>对于channel number为0的帧，AMQCommand的handleFrame方法都是返回true.（有关AMQCommand的实现细节可以参考：（<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214811">[六]RabbitMQ-客户端源码之AMQCommand</a>））<br>进而调用AMQChannel的handleCompleteInboundCommand(command)方法：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">handleCompleteInboundCommand</span><span class="params">(AMQCommand command)</span> <span class="keyword">throws</span> IOException &#123;</span><br><span class="line">    <span class="comment">// First, offer the command to the asynchronous-command</span></span><br><span class="line">    <span class="comment">// handling mechanism, which gets to act as a filter on the</span></span><br><span class="line">    <span class="comment">// incoming command stream.  If processAsync() returns true,</span></span><br><span class="line">    <span class="comment">// the command has been dealt with by the filter and so should</span></span><br><span class="line">    <span class="comment">// not be processed further.  It will return true for</span></span><br><span class="line">    <span class="comment">// asynchronous commands (deliveries/returns/other events),</span></span><br><span class="line">    <span class="comment">// and false for commands that should be passed on to some</span></span><br><span class="line">    <span class="comment">// waiting RPC continuation.</span></span><br><span class="line">    <span class="keyword">if</span> (!processAsync(command)) &#123;</span><br><span class="line">        <span class="comment">// The filter decided not to handle/consume the command,</span></span><br><span class="line">        <span class="comment">// so it must be some reply to an earlier RPC.</span></span><br><span class="line">        nextOutstandingRpc().handleCommand(command);</span><br><span class="line">        markRpcFinished();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>进而调用AMQChannel的processAsync方法。这个方法在AMQChannel类中是一个抽象方法，而观察AMQConnection中的AMQChannel _channel0私有变量其正好实现了这个方法：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** The special channel 0 (not managed by the_channelManager) */</span></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">final</span> <span class="type">AMQChannel</span> <span class="variable">_channel0</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">AMQChannel</span>(<span class="built_in">this</span>, <span class="number">0</span>) &#123;</span><br><span class="line">    <span class="meta">@Override</span> <span class="keyword">public</span> <span class="type">boolean</span> <span class="title function_">processAsync</span><span class="params">(Command c)</span> <span class="keyword">throws</span> IOException &#123;</span><br><span class="line">        <span class="keyword">return</span> getConnection().processControlCommand(c);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure><blockquote><p>ChannelN中也实现了processAsync方法。（有关ChannelN的实现细节可以参考：（<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214863">[八]RabbitMQ-客户端源码之ChannelN</a>））</p></blockquote><p>进而调用了AMQConnection的processControlCommand方法：</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Handles incoming control commands on channel zero.</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@see</span> ChannelN#processAsync</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@SuppressWarnings(&quot;unused&quot;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="type">boolean</span> <span class="title function_">processControlCommand</span><span class="params">(Command c)</span> <span class="keyword">throws</span> IOException</span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">// Similar trick to ChannelN.processAsync used here, except</span></span><br><span class="line">    <span class="comment">// we&#x27;re interested in whole-connection quiescing.</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">// See the detailed comments in ChannelN.processAsync.</span></span><br><span class="line"></span><br><span class="line">    <span class="type">Method</span> <span class="variable">method</span> <span class="operator">=</span> c.getMethod();</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (isOpen()) &#123;</span><br><span class="line">        <span class="keyword">if</span> (method <span class="keyword">instanceof</span> AMQP.Connection.Close) &#123;</span><br><span class="line">            handleConnectionClose(c);</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (method <span class="keyword">instanceof</span> AMQP.Connection.Blocked) &#123;</span><br><span class="line">            AMQP.Connection.<span class="type">Blocked</span> <span class="variable">blocked</span> <span class="operator">=</span> (AMQP.Connection.Blocked) method;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                <span class="keyword">for</span> (BlockedListener l : <span class="built_in">this</span>.blockedListeners) &#123;</span><br><span class="line">                    l.handleBlocked(blocked.getReason());</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Throwable ex) &#123;</span><br><span class="line">                getExceptionHandler().handleBlockedListenerException(<span class="built_in">this</span>, ex);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (method <span class="keyword">instanceof</span> AMQP.Connection.Unblocked) &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                <span class="keyword">for</span> (BlockedListener l : <span class="built_in">this</span>.blockedListeners) &#123;</span><br><span class="line">                    l.handleUnblocked();</span><br><span class="line">                &#125;</span><br><span class="line">            &#125; <span class="keyword">catch</span> (Throwable ex) &#123;</span><br><span class="line">                getExceptionHandler().handleBlockedListenerException(<span class="built_in">this</span>, ex);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">if</span> (method <span class="keyword">instanceof</span> AMQP.Connection.Close) &#123;</span><br><span class="line">            <span class="comment">// Already shutting down, so just send back a CloseOk.</span></span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                _channel0.quiescingTransmit(<span class="keyword">new</span> <span class="title class_">AMQP</span>.Connection.CloseOk.Builder().build());</span><br><span class="line">            &#125; <span class="keyword">catch</span> (IOException _e) &#123; &#125; <span class="comment">// ignore</span></span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (method <span class="keyword">instanceof</span> AMQP.Connection.CloseOk) &#123;</span><br><span class="line">            <span class="comment">// It&#x27;s our final &quot;RPC&quot;. Time to shut down.</span></span><br><span class="line">            _running = <span class="literal">false</span>;</span><br><span class="line">            <span class="comment">// If Close was sent from within the MainLoop we</span></span><br><span class="line">            <span class="comment">// will not have a continuation to return to, so</span></span><br><span class="line">            <span class="comment">// we treat this as processed in that case.</span></span><br><span class="line">            <span class="keyword">return</span> !_channel0.isOutstandingRpc();</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123; <span class="comment">// Ignore all others.</span></span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>这个方法是用来处理AMQP控制命令的：Connection.Close&#x2F;CloseOk, Connection.Blocked&#x2F;.Unblocked。正常情况下（比如Connection.Start&#x2F;.StartOk）直接返回false。</p><p>这样就会运行到 nextOutstandingRpc().handleCommand(command);这句代码，意思就是将从broker接受到的AMQCommand对象存入RpcContinuation对象，确切的来说是SimpleBlockingRpcContinuation这个对象中，更确切的来说是存放到容量为1的BlockingQueue中，等待其余的线程来“take()”。有关RpcContinuation或者SimpleBlockingRpcContinuation细节可以参考：<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214791">[五]RabbitMQ-客户端源码之AMQChannel</a>。</p><blockquote><p>我们假设有一个可靠的面向流的网络传输层（TCP&#x2F;IP或相当）。在单个套接字连接中，可以存在多个独立控制线程，这些称之为通道。每个帧都使用通道编号来编号。通过交织他们的帧，不同的通道共享连接。对于给定的通道，帧运行在一个严格的序列，这样可以用来驱动一个协议解析器（通常是一个状态机）。</p></blockquote><p>当channel_number!&#x3D;0则需要从ChannelManager中根据channel number找出相应的AMQChannel再调用handleFrame方法处理。<br>这里的ChannelManager从何而来？<br>这里就还是要到AMQChannel的start()方法来看，有这么一句：_channelManager &#x3D; instantiateChannelManager(channelMax, threadFactory);</p><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//AMQConnection类中</span></span><br><span class="line"><span class="keyword">protected</span> ChannelManager <span class="title function_">instantiateChannelManager</span><span class="params">(<span class="type">int</span> channelMax, ThreadFactory threadFactory)</span> &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">ChannelManager</span>(<span class="built_in">this</span>._workService, channelMax, threadFactory);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//ChannelManager的构造方法</span></span><br><span class="line"><span class="keyword">public</span> <span class="title function_">ChannelManager</span><span class="params">(ConsumerWorkService workService, <span class="type">int</span> channelMax, ThreadFactory threadFactory)</span> &#123;</span><br><span class="line">    <span class="keyword">if</span> (channelMax == <span class="number">0</span>) &#123;</span><br><span class="line">        <span class="comment">// The framing encoding only allows for unsigned 16-bit integers</span></span><br><span class="line">        <span class="comment">// for the channel number</span></span><br><span class="line">        channelMax = (<span class="number">1</span> &lt;&lt; <span class="number">16</span>) - <span class="number">1</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    _channelMax = channelMax;</span><br><span class="line">    channelNumberAllocator = <span class="keyword">new</span> <span class="title class_">IntAllocator</span>(<span class="number">1</span>, channelMax);</span><br><span class="line"></span><br><span class="line">    <span class="built_in">this</span>.workService = workService;</span><br><span class="line">    <span class="built_in">this</span>.threadFactory = threadFactory;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>ChannelManager构造方法中的ConsumerWorkService参数就是AMQConnection中start()方法第一行代码初始化的ConsumerWorkService对象。</p><p>有关ChannelManager的实现细节可以参考：（<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214754">[三]RabbitMQ-客户端源码之ChannelManager</a>）</p><p>当channel number等于0的时候是调用AMQChannel，也可以说是AQMConnection的内部成员变量AMQChannel _channel0来处理。</p><p>当channel number不等于0时，这个接下去的处理就要涉及到整个RabbitMQ-Client代码最核心的类——ChannelN。可以类别上上面channel number为0的情况，具体可以参考：<a target="_blank" rel="noopener external nofollow noreferrer" href="http://blog.csdn.net/u013256816/article/details/70214863">[八]RabbitMQ-客户端源码之ChannelN</a>。</p></article><div class="post-copyright"><div class="copyright-cc-box"><i class="anzhiyufont anzhiyu-icon-copyright"></i></div><div class="post-copyright__author_box"><a class="post-copyright__author_img" href="/" title="头像"><img class="post-copyright__author_img_back" src= "" onerror="this.onerror=null,this.src=&quot;/img/404.jpg&quot;" data-lazy-src="https://q1.qlogo.cn/g?b=qq&amp;nk=2071916845&amp;s=640" title="头像" alt="头像"><img class="post-copyright__author_img_front" src= "" 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